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Toshiba exec claims hard drives are 7X cheaper than SSDs and will continually evolve for large datacenters
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
Wendel from level 1 techs really likes the multi actuator spinning rust drives. You still wouldn't use them for a boot drive, but they're fast enough to saturate a sata connection, while still being much more dense than ssds. They can achieve 500MB/s sequential speeds, so they're plenty fast for large file access. Most consumers should be using SSD's but if you're dealing with more than a couple terabytes, the best solution isn't as straightforward.